Question

I’d like to trigger an event once after key down and a different event only after the down arrow key has been released, like so:

$('body').keydown(function (e)
{
    if(e.keyCode==40)
    {
        //do something
    }
    $('body').keyup(function (d)
    {
        if(d.keyCode==40)
        {
            //do something else
        }
    }
}

This code only functions partially. The keydown is triggered continuously as the down arrow key is held.

I have a setInterval whose refresh rate I’m altering when I hold the arrow key. Unforunately setTimeOut isn’t an option in this situation.

So my code looks something like this:

        clearInterval(interval);
        refresh = 100;
        interval();

Answer 1

$('body').keydown(function (e) {
    if(e.keyCode==40) {
        //do something
    }
    return false;
})
.keyup(function(e) {
    if(e.keyCode==40) {
        //do something else
    }
    return false;
});


$('body').on('keyup', function (e) {
    if(e.keyCode==40) {
        //do something
    }
    // after first keyup set to handle next keydown only once:
    $(this).one('keydown', function(e) {
        if(e.keyCode==40) {
            //do something else
        }
    });
});

If you need exactly trigger the event and not handle as it’s in your example, then you need to use $.trigger() method.